71554661 has 4 divisors (see below), whose sum is σ = 71692524. Its totient is φ = 71416800.

The previous prime is 71554643. The next prime is 71554663. The reversal of 71554661 is 16645517.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 51394561 + 20160100 = 7169^2 + 4490^2 .

It is a cyclic number.

It is not a de Polignac number, because 71554661 - 2⁶ = 71554597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71554663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68150 + ... + 69191.

It is an arithmetic number, because the mean of its divisors is an integer number (17923131).

Almost surely, 2^71554661 is an apocalyptic number.

It is an amenable number.

71554661 is a deficient number, since it is larger than the sum of its proper divisors (137863).

71554661 is a wasteful number, since it uses less digits than its factorization.

71554661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137862.

The product of its digits is 25200, while the sum is 35.

The square root of 71554661 is about 8458.9988178271. The cubic root of 71554661 is about 415.1572656006.

The spelling of 71554661 in words is "seventy-one million, five hundred fifty-four thousand, six hundred sixty-one".